private Path <P, Vec3> CrossSection(Vec3 start, float bottom, int nodeCount)
{
start.Z -= 0.75f;
var cPoints = new Vec3[]
{
start,
new Vec3(start.X * 1.2f, bottom * 0.6f, start.Z),
new Vec3(start.X * 0.9f, bottom * 1.2f, start.Z),
};
var spline = BSpline <Vec3> .FromControlPoints(2,
cPoints.Append (new Vec3(0f, bottom * 1.35f, start.Z))
.Concat (cPoints.Select(v => new Vec3(-v.X, v.Y, v.Z)).Reverse())
.ToArray());
return(Path <P, Vec3> .FromBSpline(spline, nodeCount - 1));
}
private Path <P, Vec3> CrossSection(Vec3 start, float top, int nodeCount)
{
start *= new Vec3(2f, 1f, 1f);
var cPoints = new Vec3[]
{
start,
new Vec3(start.X * 0.7f, top * 0.1f, start.Z),
new Vec3(start.X * 0.6f, top * 0.7f, start.Z),
};
var spline = BSpline <Vec3> .FromControlPoints(2,
cPoints.Append (new Vec3(0f, top * 1.5f, start.Z))
.Concat (cPoints.Select(v => new Vec3(-v.X, v.Y, v.Z)).Reverse())
.ToArray());
return(Path <P, Vec3> .FromBSpline(spline, nodeCount));
}
public Nose(float middleHeight, float baseHeight, int numPoints, float bottomFlatness)
{
var spline = BSpline <Vec3> .FromControlPoints(2,
new Vec3 (-1f, 0f, 0f),
new Vec3 (0f, middleHeight, 0f),
new Vec3 (1f, baseHeight, 0f));
Profile = Path <P, Vec3> .FromBSpline(spline, 8);
Cone = Lathe <V> .Turn(Profile,
turnAxis : Axis.X,
offset : new Vec3(0f),
stepAngle : MathHelper.TwoPi / numPoints)
.ManipulateVertices(
Manipulators.Scale <V> (1f, 1f - bottomFlatness, 1f).Where(v => v.position.Y < 0f), true)
.RotateY(90f.Radians())
.Color(_color);
XSection = Path <P, Vec3> .FromVecs(
from v in Cone.Vertices.Furthest (Dir3D.Back)
select v.position);
}
public Canopy(float frontHeight, float backHeight, float bend, int numPoints)
{
var spline = BSpline <Vec3> .FromControlPoints(2,
new Vec3 (-1.1f, 0f, 0f),
new Vec3 (-1f, 0.2f, 0f),
new Vec3 (-0f, frontHeight, 0f),
new Vec3 (1f, backHeight, 0f),
new Vec3 (2.5f, 0.1f, 0f),
new Vec3 (2.5f, 0f, 0f)
);
Profile = Path <P, Vec3> .FromBSpline(spline, numPoints);
var angle = 105f.Radians();
Geometry = Lathe <V> .Turn(Profile, Axis.X, new Vec3 (0f), MathHelper.Pi / numPoints,
-angle, angle)
.RotateY(90f.Radians())
.RotateX(bend.Radians())
.Scale(0.85f, 1f, 1f)
.Translate(0f, 0.6f, -2.3f)
.Color(VertexColor <Vec3> .DarkGlass)
.Reflectivity(0.4f);
}